1
|
Proximal Tubular Development Is Impaired with Downregulation of MAPK/ERK Signaling, HIF-1 α, and Catalase by Hyperoxia Exposure in Neonatal Rats. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:9219847. [PMID: 31558952 PMCID: PMC6735195 DOI: 10.1155/2019/9219847] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 06/04/2019] [Indexed: 12/22/2022]
Abstract
Supplemental oxygen therapy (hyperoxia) is a widely used treatment for alveolar hypoxia in preterm infants. Despite being closely monitored, hyperoxia exposure is believed to undermine neonatal nephrogenesis and renal function caused by elevated oxidative stress. Previous studies have mostly focused on the hyperoxia-induced impairment of glomerular development, while the long-term impact of neonatal hyperoxia on tubular development and the regulatory component involved in this process remain to be clarified. Here, we examined tubular histology and apoptosis, along with the expression profile of mitogen-activated protein kinase (MAPK)/extracellular signal-regulated kinase (ERK) signaling, hypoxia-inducible factor 1α (HIF-1α), and catalase, following hyperoxia exposure in neonatal rats. Hematoxylin and eosin (H&E) staining revealed the early disappearance of the nephrogenic zone, as well as dilated lumens and reduced epithelial cells, of mature proximal tubules following neonatal hyperoxia. A robust increase in tubular cell apoptosis caused by neonatal hyperoxia was found using a TUNEL assay. Moreover, neonatal hyperoxia altered renal MAPK/ERK signaling activity and downregulated the expression of HIF-1α and catalase in the proximal tubules throughout nephrogenesis from S-shaped bodies to mature proximal tubules. Cell apoptosis in the proximal tubules was positively correlated with HIF-1α expression on the 14th postnatal day. Our data indicates that proximal tubular development is impaired by neonatal hyperoxia, which is accompanied by altered MAPK/ERK signaling as well as downregulated HIF-1α and catalase. Therapeutic management that targets MAPK/ERK signaling, HIF-1α, or catalase may serve as a protective agent against hyperoxia-induced oxidative damage to neonatal proximal tubules.
Collapse
|
2
|
Zhang D, Cao Y, Zuo Y, Wang Z, Mi X, Tang W. Integrated bioinformatics analysis reveals novel hub genes closely associated with pathological mechanisms of immunoglobulin A nephropathy. Exp Ther Med 2019; 18:1235-1245. [PMID: 31316619 PMCID: PMC6601137 DOI: 10.3892/etm.2019.7686] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2018] [Accepted: 05/09/2019] [Indexed: 02/06/2023] Open
Abstract
Immunoglobulin A (IgA) nephropathy (IgAN) is the most common glomerular disease. The major pathological changes associated with it affect cell proliferation, fibrosis, apoptosis, inflammation and extracellular matrix (ECM) organization. However, the molecular events underlying IgAN remain to be fully elucidated. In the present study, an integrated bioinformatics analysis was applied to further explore novel potential gene targets for IgAN. The mRNA expression profile datasets GSE93798 and GSE37460 were downloaded from the Gene Expression Omnibus database. After data preprocessing, differentially expressed genes (DEGs) were identified. Gene Ontology (GO) enrichment analysis of DEGs was performed. Protein-protein interaction (PPI) networks of the DEGs were built with the STRING online search tool and visualized by using Cytoscape, and hub genes were identified through the degree of connectivity in the PPI. The hub genes were subjected to Kyoto Encyclopedia of Genes and Genomes pathway analysis, and co-expression analysis was performed. A total of 298 DEGs between IgAN and control groups were identified, and 148 and 150 of these DEGs were upregulated and downregulated, respectively. The DEGs were enriched in distinct GO terms for Biological Process, including cell growth, epithelial cell proliferation, ERK1 and ERK2 cascades, regulation of apoptotic signaling pathway and ECM organization. The top 10 hub genes were then screened from the PPI network by Cytoscape. As novel hub genes, Fos proto-oncogene, AP-1 transcription factor subunit and early growth response 1 were determined to be closely associated with apoptosis and cell proliferation in IgAN. Tumor protein 53, integrin subunit β2 and fibronectin 1 may also be involved in the occurrence and development of IgAN. Co-expression analysis suggested that these hub genes were closely linked with each other. In conclusion, the present integrated bioinformatics analysis provided novel insight into the molecular events and novel candidate gene targets of IgAN.
Collapse
Affiliation(s)
- Dongmei Zhang
- Department of Nephrology, West China Hospital, Sichuan University, Chengdu, Sichuan 610000, P.R. China
| | - Yiling Cao
- Department of Nephrology, West China Hospital, Sichuan University, Chengdu, Sichuan 610000, P.R. China
| | - Yongdi Zuo
- Department of Nephrology, West China Hospital, Sichuan University, Chengdu, Sichuan 610000, P.R. China
| | - Zheng Wang
- Department of Nephrology, West China Hospital, Sichuan University, Chengdu, Sichuan 610000, P.R. China
| | - Xuhua Mi
- Department of Nephrology, West China Hospital, Sichuan University, Chengdu, Sichuan 610000, P.R. China
| | - Wanxin Tang
- Department of Nephrology, West China Hospital, Sichuan University, Chengdu, Sichuan 610000, P.R. China
| |
Collapse
|
3
|
Brennan EP, Mohan M, McClelland A, Tikellis C, Ziemann M, Kaspi A, Gray SP, Pickering R, Tan SM, Ali-Shah ST, Guiry PJ, El-Osta A, Jandeleit-Dahm K, Cooper ME, Godson C, Kantharidis P. Lipoxins Regulate the Early Growth Response-1 Network and Reverse Diabetic Kidney Disease. J Am Soc Nephrol 2018; 29:1437-1448. [PMID: 29490938 DOI: 10.1681/asn.2017101112] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Accepted: 01/23/2018] [Indexed: 12/13/2022] Open
Abstract
Background The failure of spontaneous resolution underlies chronic inflammatory conditions, including microvascular complications of diabetes such as diabetic kidney disease. The identification of endogenously generated molecules that promote the physiologic resolution of inflammation suggests that these bioactions may have therapeutic potential in the context of chronic inflammation. Lipoxins (LXs) are lipid mediators that promote the resolution of inflammation.Methods We investigated the potential of LXA4 and a synthetic LX analog (Benzo-LXA4) as therapeutics in a murine model of diabetic kidney disease, ApoE-/- mice treated with streptozotocin.Results Intraperitoneal injection of LXs attenuated the development of diabetes-induced albuminuria, mesangial expansion, and collagen deposition. Notably, LXs administered 10 weeks after disease onset also attenuated established kidney disease, with evidence of preserved kidney function. Kidney transcriptome profiling defined a diabetic signature (725 genes; false discovery rate P≤0.05). Comparison of this murine gene signature with that of human diabetic kidney disease identified shared renal proinflammatory/profibrotic signals (TNF-α, IL-1β, NF-κB). In diabetic mice, we identified 20 and 51 transcripts regulated by LXA4 and Benzo-LXA4, respectively, and pathway analysis identified established (TGF-β1, PDGF, TNF-α, NF-κB) and novel (early growth response-1 [EGR-1]) networks activated in diabetes and regulated by LXs. In cultured human renal epithelial cells, treatment with LXs attenuated TNF-α-driven Egr-1 activation, and Egr-1 depletion prevented cellular responses to TGF-β1 and TNF-αConclusions These data demonstrate that LXs can reverse established diabetic complications and support a therapeutic paradigm to promote the resolution of inflammation.
Collapse
Affiliation(s)
- Eoin P Brennan
- Juvenile Diabetes Research Foundation Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia.,University College Dublin Diabetes Complications Research Centre, UCD Conway Institute of Biomolecular and Biomedical Research, UCD School of Medicine and Medical Sciences, and
| | - Muthukumar Mohan
- Juvenile Diabetes Research Foundation Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia.,Department of Diabetes and
| | - Aaron McClelland
- Juvenile Diabetes Research Foundation Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia
| | - Christos Tikellis
- Juvenile Diabetes Research Foundation Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia.,Department of Diabetes and
| | - Mark Ziemann
- Juvenile Diabetes Research Foundation Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia.,Epigenetics in Human Health and Disease Laboratory, Department of Diabetes, Central Clinical School, Monash University, Clayton, Victoria, Australia
| | - Antony Kaspi
- Juvenile Diabetes Research Foundation Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia.,Epigenetics in Human Health and Disease Laboratory, Department of Diabetes, Central Clinical School, Monash University, Clayton, Victoria, Australia
| | - Stephen P Gray
- Juvenile Diabetes Research Foundation Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia
| | - Raelene Pickering
- Juvenile Diabetes Research Foundation Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia.,Department of Diabetes and
| | - Sih Min Tan
- Juvenile Diabetes Research Foundation Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia.,Department of Diabetes and
| | - Syed Tasadaque Ali-Shah
- Centre for Synthesis and Chemical Biology, UCD School of Chemistry and Chemical Biology, University College Dublin, Dublin, Ireland; and
| | - Patrick J Guiry
- Centre for Synthesis and Chemical Biology, UCD School of Chemistry and Chemical Biology, University College Dublin, Dublin, Ireland; and
| | - Assam El-Osta
- Juvenile Diabetes Research Foundation Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia.,Epigenetics in Human Health and Disease Laboratory, Department of Diabetes, Central Clinical School, Monash University, Clayton, Victoria, Australia
| | - Karin Jandeleit-Dahm
- Juvenile Diabetes Research Foundation Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia.,Department of Diabetes and
| | - Mark E Cooper
- Juvenile Diabetes Research Foundation Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia.,Department of Diabetes and
| | - Catherine Godson
- University College Dublin Diabetes Complications Research Centre, UCD Conway Institute of Biomolecular and Biomedical Research, UCD School of Medicine and Medical Sciences, and
| | - Phillip Kantharidis
- Juvenile Diabetes Research Foundation Danielle Alberti Memorial Centre for Diabetes Complications, Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia; .,Department of Diabetes and
| |
Collapse
|
4
|
Cui W, Zhang Y, Lu D, Ren M, Yuan G. Upregulation of p‑Akt by glial cell line‑derived neurotrophic factor ameliorates cell apoptosis in the hippocampus of rats with streptozotocin‑induced diabetic encephalopathy. Mol Med Rep 2015; 13:543-9. [PMID: 26549420 DOI: 10.3892/mmr.2015.4507] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 09/22/2015] [Indexed: 11/06/2022] Open
Abstract
The loss of neurotrophic factor support has been shown to contribute to the development of the central nervous system. Glial cell line‑derived neurotrophic factor (GDNF), a potent neurotrophic factor, is closely associated with apoptosis and exerts neuroprotective effects on numerous populations of cells. However, the underlying mechanisms of these protective effects remain unknown. In the present study, a significant increase in Bax levels and DNA fragmentation was observed in the hippocampus obtained from the brains of diabetic rats 60 days after diabetes had been induced. The apoptotic changes were correlated with the loss of GDNF/Akt signaling. GDNF administration was found to reverse the diabetes‑induced Bax and DNA fragmentation changes. This was associated with an improvement in the level of p‑Akt/Akt. In addition, combination of GDNF with a specific inhibitor of the phosphoinositide 3‑kinase (PI3K)/Akt pathway, Wortmannin, significantly abrogated the effects of GDNF on the levels of p‑Akt/Akt, Bax and DNA fragmentation. However, a p38 mitogen‑activated proten kinase (MAPK) inhibitor, SB203580, had no effect on the expression of p‑Akt/Akt, Bax or DNA fragmentation. These results demonstrate the pivotal role of GDNF as well as the PI3K/Akt pathway, but not the MAPK pathway, in the prevention of diabetes‑induced neuronal apoptosis in the hippocampus.
Collapse
Affiliation(s)
- Weigang Cui
- Henan Key Laboratory of Medical Tissue Regeneration, Department of Human Anatomy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
| | - Yinghua Zhang
- Henan Key Laboratory of Medical Tissue Regeneration, Department of Human Anatomy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
| | - Derong Lu
- Department of Internal Digestive Medicine, The Third Affiliated Hospital of Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
| | - Mingxin Ren
- Henan Key Laboratory of Medical Tissue Regeneration, Department of Human Anatomy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
| | - Guoyan Yuan
- Department of Neurosurgery, The First Affiliated Hospital, Xinxiang Medical University, Weihui, Henan 453100, P.R. China
| |
Collapse
|
5
|
Chu L, Wang T, Hu Y, Gu Y, Su Z, Jiang H. Activation of Egr-1 in human lung epithelial cells exposed to silica through MAPKs signaling pathways. PLoS One 2013; 8:e68943. [PMID: 23874821 PMCID: PMC3715534 DOI: 10.1371/journal.pone.0068943] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2013] [Accepted: 05/26/2013] [Indexed: 12/19/2022] Open
Abstract
The alveolar type II epithelial cell, regarded historically as a key target cell in initial injury by silica, now appears to be important in both defense from lung damage as well as elaboration of chemokines and cytokines. The molecular basis for silica-induced epithelial cell injury is poorly understood. In this study we explored the activation of nuclear factor Egr-1 and related signal pathway. Human II alveolar epithelial line A549 cells were exposed to silica for indicated time to assay the expression and activation of Egr-1 and upstream MAPKs. Immunofluorescence, western-blot techniques, RT-PCR, Electrophoretic mobility shift assay (EMSA), transient transfection assay, kinase inhibitor experiments were performed. It was found that the expression of Egr-1 at mRNA and protein level was significantly increased in A549 cells after administration with silica and the activity of Egr-1 peaked by silica treatment for 60 minutes. Furthermore, phosphorylated-ERK1/2, P38 MAPKs (the upstream kinase of Egr-1) ballooned during 15-30minutes, 30-60minutes respectively after silica exposure in A549 cells. By administration of ERK1/2, P38 inhibitor, the expression and transcription of Egr-1 were both markedly decreased. But PKC inhibitor did not prevent the increase of Egr-1. These results indicated Egr-1 played a critical role in silica-induced pulmonary fibrosis in an ERK1/2, P38 MAPKs-dependent manner, which suggests Egr-1 is an essential regulator in silicosis, and underlines a new molecular mechanism for fibrosis induced by silica.
Collapse
Affiliation(s)
- Ling Chu
- Department of Pathology, Third Xiangya hospital, Central South University, Changsha, Hunan, PR China
| | - Tiansheng Wang
- Department of Otolaryngology, Third Xiangya hospital, Central South University, Changsha, Hunan, PR China
- * E-mail:
| | - Yongbin Hu
- Department of Pathology, Xiangya hospital, Central South University, Changsha, Hunan, PR China
| | - Yonghong Gu
- Department of Pathology, Third Xiangya hospital, Central South University, Changsha, Hunan, PR China
| | - Zanshan Su
- Department of Pathology, Third Xiangya hospital, Central South University, Changsha, Hunan, PR China
| | - Haiying Jiang
- Department of Pathology, Xiangya hospital, Central South University, Changsha, Hunan, PR China
| |
Collapse
|